﻿using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Collections;

namespace GMusicBox.Core
{
    internal class HotKey : System.Windows.Forms.IMessageFilter
    {
        Hashtable keyIDs = new Hashtable();
        IntPtr hWnd;

        public event HotkeyEventHandler OnHotKey;
        public delegate void HotkeyEventHandler(int HotKeyID);

        public enum KeyFlags
        {
            MOD_NONE = 0,
            MOD_ALT = 0x1,
            MOD_CONTROL = 0x2,
            MOD_SHIFT = 0x4,
            MOD_WIN = 0x8
        }
        [DllImport("user32.dll")]
        public static extern UInt32 RegisterHotKey(IntPtr hWnd, UInt32 id, UInt32 fsModifiers, UInt32 vk);

        [DllImport("user32.dll")]
        public static extern UInt32 UnregisterHotKey(IntPtr hWnd, UInt32 id);

        [DllImport("kernel32.dll")]
        public static extern UInt32 GlobalAddAtom(String lpString);

        [DllImport("kernel32.dll")]
        public static extern UInt32 GlobalDeleteAtom(UInt32 nAtom);

        public HotKey(IntPtr hWnd)
        {
            this.hWnd = hWnd;
            //Application.AddMessageFilter(this);
        }

        public int RegisterHotkey(Keys Key, KeyFlags keyflags)
        {
            UInt32 hotkeyid = GlobalAddAtom(System.Guid.NewGuid().ToString());
            RegisterHotKey(hWnd, hotkeyid, (UInt32)keyflags, (UInt32)Key);
            keyIDs.Add(hotkeyid, hotkeyid);
            return (int)hotkeyid;
        }

        public void UnregisterHotkeys()
        {
            //Application.RemoveMessageFilter(this);
            foreach (UInt32 key in keyIDs.Values)
            {
                UnregisterHotKey(hWnd, key);
                GlobalDeleteAtom(key);
            }
            keyIDs.Clear();
        }

        public bool PreFilterMessage(ref System.Windows.Forms.Message m)
        {
            if (m.Msg == 0x0312)
            {
                if (OnHotKey != null)
                {
                    foreach (UInt32 key in keyIDs.Values)
                    {
                        if ((UInt32)m.WParam == key)
                        {
                            OnHotKey((int)m.WParam);
                            return true;
                        }
                    }
                }
            }
            return false;
        }

        internal static string GetHotKeyString(string data)
        {
            string[] hks = data.Split(',');
            string hk = "";
            string s = "", s1 = ((Keys)int.Parse(hks[3])).ToString();
            if (int.Parse(hks[3]) >= 48 && int.Parse(hks[3]) <= 57) s1 = s1.Substring(1);

            if (Convert.ToBoolean(hks[0])) s += "Ctrl + ";
            if (Convert.ToBoolean(hks[1])) s += "Shift + ";
            if (Convert.ToBoolean(hks[2])) s += "Alt + ";
            if (s1 == "ControlKey" || s1 == "ShiftKey" || s1 == "Menu") s1 = "";
            hk = s + s1;
            if (hk.EndsWith(" + ")) hk = "";
            return hk;
        }
    }

    /*
            Hotkey hotkey;
            hotkey = new Hotkey(this.Handle);
            Hotkey1 = hotkey.RegisterHotkey(System.Windows.Forms.Keys.F2, Hotkey.KeyFlags.MOD_CONTROL);   //定义快键(Ctrl + F2)
            hotkey.OnHotkey += new HotkeyEventHandler(OnHotkey);
     */
}
